I think that both vessels were headed easterly, with the Crystal doing about 18kt and the Fitzgerald loitering slower due to scheduled arrival time in port.
Crystal came left to avoid To-Shima and head towards port. Within a few minutes Crystal closed from the starboard quarter and struck Fitzgerald. The abrupt starboard movement of Crystal at 0130 was the collision.
Crystal then resumed her ENE track until deciding that she needed to turn around and return to the site of the collision. As previously posted this delay may have been due to Iron Mike, or inattentive watch, or engineering considerations. Crystal loitered at the collision site for a bit until resuming her track to enter port.
All the investigations should serve to show us what happened, and assign blame/responsibility accordingly.
As a retired U.S. Navy Surface Warfare Officer, with thousands of hours on the bridge of a few large Navy vessels and lots of frigates and destroyers, I will also question how a bridge team, backed up by a CIC watch team, can allow this to happen - even in a busy shipping area with multiple vessels complicating the RoR picture. Someone lost the bubble.
Prayers for those who perished, and peace for their families.
Commander, USN (Ret)
Master, Oceans, Steam, Motor or Sail - 1600 Tons
Chief Mate, Oceans, Unlimited